Open Archiver Enterprise

Open Archiver Enterprise is a self-hosted email archive for organizations that need searchable records and compliance controls on infrastructure they manage. It suits teams with mailbox-level licensing needs and a preference for retaining control of email, indexes, and encryption keys. Its strongest case is the combination of journaling, retention tools, and portable email files; the per-mailbox license and feature-by-feature entitlements merit careful review before purchase.

Overview

The archive connects to Google Workspace, Microsoft 365, and IMAP, and can also bulk-import PST, EML, and MBOX files. Full-text search covers email and attachments, with EML export for taking messages out of the archive. Keeping the system self-hosted puts the data and keys on infrastructure the organization controls, a meaningful advantage for teams with strict data-governance requirements—but it also makes deployment and ongoing operation the customer’s responsibility.

Key features

Enterprise journaling captures unmodified messages for each recipient, including BCC recipients, alongside mailbox synchronization. That recipient-level capture is useful when a compliance workflow needs a record of what was sent, not merely a synchronized mailbox copy.

Retention policies, legal holds, a hash-chained audit log, and integrity reports support GoBD and GDPR-related workflows. AES-256 encryption protects archived files, while OIDC and SAML single sign-on, identity-provider group role mapping, and organization-wide two-factor-authentication policies support centralized access controls. These tools make the Enterprise edition a stronger fit for regulated or audit-conscious teams than an archive centered on storage and search alone.

Emails are stored as plain .eml files, and the product accepts bulk imports from PST, EML, and MBOX. That combination supports moving existing archives in and keeping messages in a portable format. Enterprise features are granted individually by license key, however, so buyers should confirm that their chosen license covers every required workflow rather than assume the edition includes every feature.

Pricing

The free Self-hosted plan costs nothing and is the open-source edition, with community support. It is a practical starting point for organizations that can work without Enterprise entitlements and want to run the archive on their own infrastructure.

Enterprise Edition costs €14, paid once, paid once per archived mailbox for a perpetual license. Larger seat counts receive a lower per-seat rate. The first year of updates and support is included; after support lapses, the license and Enterprise features continue working, but updates and technical support stop. This is a better fit for teams that value a one-time license and can plan for support renewal separately than for buyers seeking a recurring per-user subscription.

Because Enterprise capabilities are licensed individually, the €14/user starting price should not be treated as a guarantee that every listed Enterprise feature is included. Confirm the required entitlements and mailbox count before committing.

Platforms

Open Archiver Enterprise supports API, Linux, self-hosted, and web environments. Its installation guide describes deploying the web interface with Docker Compose on a server or local machine, giving administrators a documented route to run it on infrastructure they control.

Who it's for

Choose it if your organization needs searchable email records, recipient-level journaling, legal holds, and control over where archived data and keys reside. Plain .eml storage and bulk import options also suit teams that want accessible message files and a path for bringing existing archives into the system.

Look elsewhere if you need a managed cloud service, or if your purchase depends on a single package that guarantees every compliance feature without checking individual entitlements. The self-hosted model and mailbox-based licensing are central to the product, not incidental details.

Pros and cons

• Pros: Journaling captures unmodified messages per recipient, including BCC recipients, which is more useful for complete correspondence records than mailbox sync alone.
• Pros: Retention, legal holds, audit logging, and integrity reporting address practical compliance and investigation workflows.
• Pros: Customer-controlled hosting, encryption keys, and plain .eml storage offer data control and portability.
• Cons: The customer operates the self-hosted deployment, so it is not the straightforward choice for teams seeking a vendor-managed archive.
• Cons: Enterprise features are licensed individually, so buyers must verify feature coverage against their actual workflows.
• Cons: The perpetual license includes updates and support for only the first year; continued technical help and updates stop if support lapses.

Alternatives

MailArchiva is another freemium, self-hosted option with a perpetual per-mailbox license; consider it if its licensing and support terms better fit your deployment.

Jatheon Cloud is the cloud-oriented alternative, with annual per-user billing and unlimited storage without egress fees at exit; choose it if you prefer hosted service over customer-controlled infrastructure.

MessageSolution Enterprise Email Archive is a quote-based option with editions tied to organization size and a $600 annual maintenance minimum; consider it if that purchasing model suits your organization.

MailStore Server has a paid Starter Kit for up to five users at $259, paid once, including 12 months of standard update and support and excluding VAT; consider it if a small fixed-seat package is a closer fit.

Intradyn Email Archiving is another self-hosted archive option.

Zoho eProtect is a web-based paid alternative.

Global Relay Archive is a paid option designed for enterprise-scale recordkeeping.

OpenText Retain Unified Archiving is another paid option with broad platform support.

For a wider comparison, see Email Archiving Software.

Verdict

Open Archiver Enterprise is a strong fit for organizations that want self-hosted email retention with recipient-level journaling, compliance controls, and portable message files. Its main reason to choose is the combination of control and audit-oriented features; its main reason to look elsewhere is the operational burden of self-hosting or uncertainty about which Enterprise entitlements a license includes. Confirm feature coverage and mailbox pricing before buying.